Improvement in nut-lock



'JAMES DENN-Is, 4or cHURcHvILI.n,gNEvv 4Yon-K.

lLetters V,Patent No. l106,138, dateclvAug/ust 9, 1870.

IMPROVEMENT I NUT-LOCK.

The Schedule referred to in these Letters Patent and making part of the same I, JAMES DENNIS, of Ghurchville, in the county of Monroe and State of New York, have invented a' certain new and improved Nutl3`astening, of which the following i's a specification.

My invention consists in the Vcombination of the nut, having the inclinations and offsets formed on its back, with the metallic washer provided wit-h th'e internal spring-bearing, the saine being so constructed andeombined in relation to each other that the nut, when screwed down, cannot become accidentally looscned or unscrewed, by reason of the engagement be- ;tween the spring-bearing and the offsets of the nn't,

the said spring-bearing being alsoinclosed, so as to exclude dirt and protect it from injury.` Figure 1 is an elevation of my improved device. Figure 2, a section of the same.

.Figure 3,bacli views of the nut and the washer,

detached.

Like letters of reference indicate corresponding parts in all the `figures.

In the drawing- ,A indicates the nut; B, the washer; and 0, the bolt on which they Vare secured.

The nut A ismade of the usual form, except'that the back face is formed with notches or'oifsets, a.4 a,

and inclined planes or surfaces, b b, as shown:

'lhe metallic washer B is provided with an annular Yslot or groove on its` back face,l in which rests a spring, c, -that is secured therein by pivots, cl d, at one end.

At its opposite or freecnd is provided a bearing or catch, i, which projects out through the washer and engages with the notched surface of the nut, so as to prevent the latter from accidentally unscrewing or working loose by any jarring action.

A slot or opening, g, is formed in the side of the washer, through which a pointed wire or prong, 71,'is

inserted, as shown in fig. 2, to depress the spring bearing, when it is desired to loosen the nut.

As the nut A is screwed down against the washer B, each of the inclined surfaces b b, in passing over the bearing i of theV spring-catch c, gradually de- Ipresses the latter until it passes the offsets a, when it springs back again, as shown in g. 1.

Vhen the nut is in' place, the bearing or catch i, resting against one of the otfsets or shoulders, a, ot

the nut, thus preventsthe latter from unscrewing,

except when the spring is depressed, which is done by rneans of the point or prong h', as described.

, rlhe spring-catch being self-acting, it is only necessary to screw the uut down against the washer, when it will be secured in place. Y

r By inclosing the ,spring c in the slot or groove of the washer, it is hidden from' view, and also-protected against injury and danger of being broken, while the washer itself has'the appearance of one of the ordinary kind.

Another important feature is, that the spring c is eiect'ually protected against the collection of dust and dirt, which would seriouslyinterfere with its free operation if it were exposed.

W hat I claim as my invention, is j rEhe spring c, inclosed in the washer B, the said spring being provided with the bearing i, and the washer having the lateral opening'g, for the insert-ion of the arrnh, in combination with the nut A, having t-he offsets and inclina-'tions (L b, the whole being arranged and operating substantially as herein set forth.

In testimony whereof I hereunto sign my naine in the presence of two subscribing witnesses,

JAMES DENNIS.v

YVituesses P. V. HAwLnY, E. D. PIEnsoN. 

